Amazon has just turned on its Prime Instant Video service, letting paid Prime subscribers (sorry, students) in the US (sorry, foreigners) stream any of 5,000 movies and TV shows directly to their machines free of charge -- well, free beyond the $79 Primers already pay. Jeff Bezos has confirmed that there will be no extra charge going forward for this service and that Prime itself will not be getting more expensive to pay for all these bits and bytes. Right now the selection is limited, particularly if y
